function init() {

    return new Promise((resolve, reject) => {

        setTimeout(() => {
            resolve("完成了")
        }, 1000)


    })
}

const p = init()
p.then(resp=>{
    console.log("一号任务开始启动",resp)
})

p.then(resp=>{
    console.log("二号任务启动",resp)
    return '干得好222'
}).then(twoResp=>{
    console.log("第三个启动",twoResp)
})


